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FXOAbbreviation for foreign exchange office. The analog DC loop trunks (i.e., FXO ports) in Telesis systems are capable of receiving Caller ID information transmitted according to the ETSI ETS 300 659-1 standard as an FSK signal burst. Overvoltage and overcurrent protection on analog trunks conforms to ITU-T K.20/K.21 recommendations. |